There Hangs the Knife

1998 St. Martin's Press hardcover, Marcia Muller (The Color of Fear). Joanna Stark can't seem to forgive and forget: what happened twenty years ago still plagues her. She knows the only way it can be resolved is if she gets her revenge. So she devises an intricately-plotted plan to entrap and expose Anthony Parducci, an art thief who also happens to be her worst enemy and a man who once, a long time ago, she truly cared about. - Amazon